<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>对字符串和数字进行加法运算</title>
	<script>
		var x,y,z
		x=5+5;
		y="5"+5;
		z="Hello"+5;
		console.log(x);
		console.log(y);
		console.log(z);

		var a,b,c;
		a = 1 + 2 + "3";
		b = 1 + "2" + 3;
		c = 1 + "2" + 3 + 4;
		console.log(a);
		console.log(b);
		console.log(c);
		



	</script>
</head>
<body>
	
</body>
</html>